From sbrennan@clari.net Wed Dec 27 19:14:15 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!sbrennan From: sbrennan@clari.net (Steve Brennan) Newsgroups: comp.dsp Subject: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Dec27.191415.2247@clari.net> Date: Wed, 27 Dec 1995 19:14:15 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 10 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. At 14.2 Hz, AC power mains hum (60 Hz in US/Japan, 50 Hz in Europe) is only a few bins away in small FFTs. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. Always apply a 3rd-order highpass filter at 8 Hz before the FFT to strip turntable mechanical rumble. -- Steve Brennan -- ClariNet Communications Corp "Do not worship the copy." From alopez@titech.ac.jp Fri Dec 29 18:57:15 1995 Path: ashpoly!cascade!bigsur!titech!alopez From: alopez@titech.ac.jp (Astrid López) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Dec29.185715.4448@titech.ac.jp> Date: Fri, 29 Dec 1995 18:57:15 GMT References: <1995Dec27.191415.2247@clari.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Dec27.191415.2247@clari.net>, sbrennan@clari.net (Steve Brennan) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > At 14.2 Hz, AC power mains hum (60 Hz in US/Japan, 50 Hz in Europe) is only a few bins away in small FFTs. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Astrid López SupraFAXModem 28.8 @ 19,200 bps "We don't sign stars. We build them." From mjohansson@cern.ch Sun Dec 31 02:01:15 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!mjohansson From: mjohansson@cern.ch (Mike Johansson) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Dec31.020115.9941@cern.ch> Date: Sun, 31 Dec 1995 02:01:15 GMT References: <1995Dec27.191415.2247@clari.net> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Dec27.191415.2247@clari.net>, sbrennan@clari.net (Steve Brennan) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Mike Johansson US Robotics Courier V.34 @ 33,600 bps "A soul is not exclusive to biology."